A reproducible test to characterise the triboelectric charging of powders during their pneumatic transport

Ndama, Adoum Traoré; Guigon, Pierre; Saleh, Khashayar

doi:10.1016/j.elstat.2011.03.003

Cited by 38 publications

(15 citation statements)

References 46 publications

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“…The grains are brought into contact with each other in different charging devices (conveyer belt [1,2], cyclone [3,4], drum [5,6], etc.). It is applied to separate insulating primary as well as secondary materials with particle sizes less than 2 mm for minerals and 10 mm for polymers.…”

Section: Introductionmentioning

confidence: 99%

“…Measuring the amount of the transferred charge utilizing classic Kelvin probe methods [17], Faraday cages [1,18], or electrostatic voltmeters [19] only provide average values for large areas (about a few hundreds of square microns or many grains), and are not suitable to explore single charging events of individual grains. Therefore, an isolation of parameters, such as contact force, contact area, time of contact, and contact between charged and uncharged grains, is difficult.…”

Section: Introductionmentioning

confidence: 99%

“…It is applied to separate insulating primary as well as secondary materials with particle sizes less than 2 mm for minerals and 10 mm for polymers. The grains are brought into contact with each other in different charging devices (conveyer belt [1,2], cyclone [3,4], drum [5,6], etc.). The grains, differently charged upon contact, are separated in an electric field depending on the sign and amount of their surface charge.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Atomic Force Microscopy as a Tool to Explore Triboelectrostatic Phenomena in Mineral Processing

Mirkowska

Kratzer

Teichert

et al. 2014

Chemie Ingenieur Technik

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Electrification of insulators has been applied for years in the triboelectrostatic separation of minerals. However, the knowledge of the charge exchange during particle contact is still limited. Here, the electric charging of calcite single crystals upon contact with atomic force microscopy (AFM) probes was studied through different contact types. A combination of contactmode AFM and Kelvin probe force microscopy was employed to verify the local surface potentials before and after charging, and focused on the influence of contact time, load force, and applied bias on the charge transfer. a) b) Figure 6. KPFM measurements presenting the surface potential distribution for the calcite surface after repeated charging on an area of 4 × 4 lm 2 , wherein the AFM tip was pressed to the surface with a force of ∼3 lN and bias applied to the AFM tip was (a) -10 V and (b) +10 V. Corresponding curves of charge development and decay are also shown. Crosses (x) between KPFM images indicate charging events. The diagrams in the bottom show the evolution of surface potential with time: symbols D, ᮀ, and ᭜ represent maximum, minimum, and average values, respectively, of the surface potential collected from an area of 10 × 10 lm 2 .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Atomic Force Microscopy as a Tool to Explore Triboelectrostatic Phenomena in Mineral Processing

Mirkowska

Kratzer

Teichert

et al. 2014

Chemie Ingenieur Technik

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“…Ndama et al [43] pointed out that electrostatic charging of powders would cause several difficulties during the processing, conveying, and storage of powders, such as losses in quality and productivity as well as severe accidents like explosions. After each conveying process, a very thin layer of fine pulverized coal particles was observed, adhering to internal walls of the blow tank and the conveying pipe.…”

Section: Effect Of Pulverized Coal External MCmentioning

confidence: 99%

Conveying Characteristics of Pulverized Coal in a Top‐Discharge Blow Tank System

Chen

Liang

et al. 2013

Chem Eng & Technol

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Based on the experiments of pulverized coal pneumatic conveying using nitrogen as carrier, the influences of riser inlet height above the gas distribution plate, riser diameter, pulverized coal external moisture content, and supplemental gas flow rate on the conveying characteristics such as pulverized coal mass flow rate and solid-gas ratio were investigated in a laboratory-scale experimental setup of a top-discharge blow tank under atmospheric pressure. There exists an optimal riser inlet height for a given top-discharge blow tank. The supplemental gas is one of the critical factors affecting the conveying stability and continuity. A model for material mass flow rate prediction with errors ranging from -25 % to +15 % is presented.

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“…In the current study, PTFE was selected as the insulating actuator material representing the most electronegative polymer in the triboelectric series (33). After contact with other materials, PTFE has a high tendency to become negatively charged, leading the material in contact to become positively charged.…”

Section: Ptfe Actuatormentioning

confidence: 99%

The Effect of Actuator Nozzle Designs on the Electrostatic Charge Generated in Pressurised Metered Dose Inhaler Aerosols

et al. 2014

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A reproducible test to characterise the triboelectric charging of powders during their pneumatic transport

Cited by 38 publications

References 46 publications

Atomic Force Microscopy as a Tool to Explore Triboelectrostatic Phenomena in Mineral Processing

Atomic Force Microscopy as a Tool to Explore Triboelectrostatic Phenomena in Mineral Processing

Conveying Characteristics of Pulverized Coal in a Top‐Discharge Blow Tank System

The Effect of Actuator Nozzle Designs on the Electrostatic Charge Generated in Pressurised Metered Dose Inhaler Aerosols

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